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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transaxle - 4T80-E - Introduction (2 Of 2)) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, Second Gear >> Second Clutch Applies

Second Clutch Applies

WARNING: This page is about a different variant/trim than selected.

1-2 Shift Solenoid (SS) Valve 

De-energized (turned OFF) by the PCM, the 1-2 SS valve exhausts fluid through the solenoid valve. This creates a low fluid pressure from the 1-2 SS valve in the circuit. This low solenoid pressure allows the 1-2 shift valve to move to the upshifted position. The 3-4 shift valve moves to the downshifted position.

1-2 Shift Valve 

Spring force and low fluid pressure in the 2-3 shift solenoid (SS) valve hold the 1-2 shift valve in the upshifted position. The 1-2 shift valve allows orificed drive fluid to pass through the valve into the second clutch circuit. Second clutch fluid is then routed to the 1-2 accumulator piston and to the second clutch piston in order to apply the clutch.

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